A low-temperature-resistant two-component solvent-free epoxy coating for pipe joints

Abstract

A low-temperature resistant two-component solvent-free epoxy coating, which is composed of A component and B component, wherein in weight percentage, A component includes: bisphenol F type epoxy resin 30-45%, bisphenol A type Epoxy resin 5‑10%, epoxy nitrile prepolymer 5‑10%, glycidyl ether reactive diluent 3‑7%, modified silica powder 15‑25%, titanium dioxide 8‑15%, tripolyphosphoric acid Aluminum dihydrogen 3‑10%, mica powder 4‑10%, thixotropic agent 0.6‑1.4%, dispersant 0.2‑0.5%, leveling agent 0.2‑0.5%, defoamer 0.3‑0.7%, carbon black 0.1‑ 0.7%; B component includes: Mannich base 50-75%, thiourea-polyamine condensate 25-50%. Compared with ordinary epoxy coatings, the low-temperature resistant two-component solvent-free epoxy coating for pipe jointing of the present invention has fast curing speed at low temperature, no crystallization and no precipitation, excellent low-temperature bending resistance, excellent low-temperature impact resistance, and heat resistance Excellent water immersion performance, excellent thermal shock resistance and other characteristics.

Description

technical field [0001] The invention relates to a low-temperature-resistant two-component solvent-free epoxy anticorrosion coating for jointing of oil and gas pipelines, belonging to the technical field of oil and gas pipeline anticorrosion. Background technique [0002] At present, most of the main anti-corrosion layers of domestic oil and gas pipelines use 3PE anti-corrosion layers, while most of the joint anti-corrosion materials still use radiation cross-linked polyethylene heat shrinkable tape. Since the insulation resistance of radiation cross-linked polyethylene is very large, it will shield the cathodic protection current, resulting in the failure of the cathodic protection current. Two-component solvent-free epoxy coating, as a new type of sealing material, has the advantages of simple coating process, easy repair, reliable inspection results, no cathodic protection current shielding, etc., and has developed rapidly in the field of domestic pipeline joint anticorros...

AI Technical Summary

Problems solved by technology

[0004] With the promotion and use of two-component solvent-free epoxy coatings in the field of oil and gas pipeline joints, the existing two-component solvent-free epoxy coatings on the market have the following defects: ①The commonly used two-component solvent-free epoxy coatings for pipeline joints When the temperature is lower than 0 ℃, the curing speed of oxygen coating is very slow or even not curing, which is not conducive to the winter construction of pipeline joint anticorrosion in northern my country; , in the northern region of my country (the temperature can reach minus 30°C in winter), low-temperature cracking is prone to occur, resulting in anti-corrosion failure; ③The conventional two-component solvent-free epoxy coating has poor low-temperature bending resistance. In the northern region, during winter construction, When the pipe is welded and anti-corrosion, when it goes down the ditch, when the pipe is slightly bent, cracks are prone to occur at the joint part of the epoxy coating, which directly leads to the failure of the joint anti-corrosion

Images